Caffeine has a half life of roughly 2.5 to 4 hours. Which means that in that amount of time half of the caffeine will have been metabolized by your body. Caffeine only last a few hours depending on the consumption and your activity.
The amount of time spent playing video games has a negative correlation with academic performance (Gentile, D. 2004).On the other hand children also learn obsessive language and violent behavior from these violent video games which disturb child's mental status.
Yes because studies have shown if you play violent video games you have bad behavior. I agree with this because every time you play a violent video game, you change. You keep talking about and don't stop. At school your education grades will fall because you keep wanting to play it and don't bother paying attention.